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CSEE Journal of power and Energy Systems 2022年第3期8卷 710-720页

作者： Lin Yu Huadong Sun Shiyun Xu Bing Zhao Jian Zhang State Key Laboratory of power Grid Safety and Energy Conservation China Electric Power Research InstituteBeijing100192China

The power system is experiencing a higher penetration of renewable energy generations(REGs).The short circuit ratio(SCR)and the grid impedance ratio(GIR)are two indices to quantify the system strength of the power system with *** this paper,the critical short circuit ratio(CSCR)is defined as the corresponding SCR when the system voltage is in the critical stable *** static voltage stability analysis,the mathematical expression of the CSCR considering the impact of GIR is *** maximum value of CSCR is adopted as the critical value to distinguish the weak power *** on the static equivalent circuit analysis,it is proved that the CSCR is still effective to evaluate critical system strength considering the interactive impact among ***,we find that the GIR can be neglected and the SCR can be used individually to evaluate the system strength when SCR>2 or GIR>*** correctness and rationality of the CSCR and its critical value are validated on ADPSS.

关键词： Critical short circuit ratio critical value grid impedance ratio maximum power transfer theorem static equivalent circuit analysis

Distributionally robust optimization model of active distribution network considering uncertainties of source and load

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Journal of Modern power Systems and Clean Energy 2019年第6期7卷 1585-1595页

作者： Lei DONG Jia LI Tianjiao PU Naishi CHEN power System research institute North China Electric Power UniversityBeijing 102206China china electric power research institute Beijing 100192China

To ensure the safety and reliability of the distribution network and adapt to the uncertain development of renewable energy sources and loads,a two-stage distributionally robust optimization model is proposed for the active distribution network(ADN)optimization problem considering the uncertainties of the source and load in this *** establishing an ambiguity set to capture the uncertainties of the photovoltaic(PV)power,wind power and load,the piecewise-linear function and auxiliary parameters are introduced to help characterize the probability distribution of uncertain *** optimization goal of the model is to minimize the total expected cost under the worst-case distribution in the ambiguity *** first-stage expected cost is obtained based on the predicted value of the uncertainty *** second-stage expected cost is based on the actual value of the uncertainty variable to solve the first-stage *** generalized linear decision rule approximates the two-stage optimization model,and the affine function is introduced to provide a closer approximation to the second-stage optimization ***,the improved IEEE 33-node and IEEE 118-node systems are simulated and analyzed with deterministic methods,stochastic programming,and robust optimization methods to verify the feasibility and superiority of the proposed model and algorithm.

关键词： Active distribution network(ADN) Source-load uncertainty Two-stage distributionally robust optimization Ambiguity set Generalized linear decision rule

High-accuracy and Low-complexity Phasor Estimation Method for PMU Calibration

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CSEE Journal of power and Energy Systems 2021年第6期7卷 1202-1212页

作者： Jinsong Li Sudi Xu Hao Liu Tianshu Bi north china electric power university and china electric power research institute Beijing 102206China State Key Lab of Alternate electric power System With Renewable Energy Sources North China Electric Power UniversityBeijing 102206China

Due to the increasing development of renewables in power systems,the requirements for phasor measurement units(PMUs)becomes higher.A PMU calibrator is an important tool to test and calibrate PMUs to ensure their measurement *** device can provide accurate reference values for error analysis of *** this paper,a phasor algorithm with low computational complexity and high accuracy is proposed for the PMU *** method reduces the processor requirements and development costs of the calibrator,thereby facilitating its *** first,an enhanced discrete Fourier transform(DFT)method is put forward:1)the frequency response of the windowed DFT method is analyzed to reveal its large measurement errors under dynamic conditions;2)the parameter requirements of the DFT window that is regarded as a lowpass filter are analyzed,and thus a lowpass filter with better filtering performance is designed as the window coefficients to improve the estimation ***,based on the enhanced DFT algorithm,a calibrator algorithm framework consisting of two-stage filters and a signal recognition module is *** algorithm can consider the anti-interference ability and dynamic measurement accuracy at a low reporting *** and experimental test results show that the proposed calibrator algorithm provides high-accuracy measurements of the static and dynamic signals with low computational complexity.

关键词： Phasor measurement unit(PMU) PMU calibrator PMU test windowed DFT algorithm

Advancements and Challenges in Organic–Inorganic Composite Solid Electrolytes for All‑Solid‑State Lithium Batteries

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Nano-Micro Letters 2025年第1期17卷 46-97页

作者： Xueyan Zhang Shichao Cheng Chuankai Fu Geping Yin Liguang Wang Yongmin Wu Hua Huo State Key Laboratory of Space power‑Sources School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001People’s Republic of China College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310058People’s Republic of China State Key Laboratory of Space power-Sources 2965 Dongchuan RoadMinhang DistrictShanghai 200240People’s Republic of China

To address the limitations of contemporary lithium-ion batteries,particularly their low energy density and safety concerns,all-solid-state lithium batteries equipped with solid-state electrolytes have been identified as an up-and-coming *** the various SEs,organic–inorganic composite solid electrolytes(OICSEs)that combine the advantages of both polymer and inorganic materials demonstrate promising potential for large-scale ***,OICSEs still face many challenges in practical applications,such as low ionic conductivity and poor interfacial stability,which severely limit their *** review provides a comprehensive overview of recent research advancements in ***,the influence of inorganic fillers on the main functional parameters of OICSEs,including ionic conductivity,Li+transfer number,mechanical strength,electrochemical stability,electronic conductivity,and thermal stability are systematically *** lithium-ion conduction mechanism of OICSE is thoroughly analyzed and concluded from the microscopic ***,the classic inorganic filler types,including both inert and active fillers,are categorized with special emphasis on the relationship between inorganic filler structure design and the electrochemical performance of ***,the advanced characterization techniques relevant to OICSEs are summarized,and the challenges and perspectives on the future development of OICSEs are also highlighted for constructing superior ASSLBs.

关键词： Composite solid electrolytes Inorganic filler Interfacial stability Li-ion conduction mechanism Characterization techniques

Dynamic Response of Tension Plate for UHVDC Transmission Lines Under Ice Shedding Loads

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CSEE Journal of power and Energy Systems 2022年第3期8卷 952-962页

作者： Jiajun Si Lixian Zhou Kuanjun Zhu Hongyan Zhao Bin Liu Xiaoming Rui Shengchun Liu china electric power research institute Beijing 100192China north china electric power university Beijing 102206China Beijing institute of Astronautical Systems Engineering Beijing 100075China electric power research institute Beijing 100192China

Ice shedding problems have severely threatened the safety of overhead transmission lines and caused enormous ruptures or failures of the conductors and their *** is of great importance to study the dynamic properties of the transmission lines under ice shedding *** perform such analysis,the dynamic behavior of two typical strain sections for UHVDC transmission lines under different ice shedding conditions were simulated in this ***,the dynamic response of the key tension plate as well as its buckling properties was analyzed based on the extacted ice shedding ***,laboratory tests were conducted at the china electric power research institute to assess the critical value of the buckling of the tension *** results show that the key tension plate studied in this paper is primarily influenced by the loads along the transmission lines after taking its dynamic response and buckling properties under synthetic ice shedding conditions into *** short-term fluctuation of the tension should be the major focus in tension plate designs.

关键词： Dynamic response ice shedding effect nonlinear buckling tension plate UHVDC transmission lines

Utlra-fast hydrolysis performance of MgH_(2) catalyzed by Ti-Zr-Fe-Mn-Cr-V high-entropy alloys

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Journal of Energy Chemistry 2024年第11期98卷 77-86页

作者： Jinting Chen Tingting Xu Zeyu Zhang Jinghan Zhang Haixiang Huang Bogu Liu Yawei Li Jianguang Yuan Bao Zhang Ying Wu School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China institute of Energy power Innovation North China Electric Power UniversityBeijing 102206China

Hydrogen energy is one of the ideal energy alternatives and the upstream of the hydrogen industry chain is hydrogen production,which can be achieved via the reaction of inorganic materials with water,known as *** inorganic materials,the high hydrogen capacity for hydrolysis of MgH_(2)(15.2 wt%)makes it a promising material for hydrogen production via ***,the dense Mg(OH)_(2) passivation layer will block the reaction between MgH_(2) and the solution,resulting in low hydrogen yield and sluggish hydrolysis *** this work,the hydrogenyield and hydrogen generation rate of MgH_(2) are considerably enhanced by adding Ti-Zr-Fe-Mn-Cr-V high-entropy alloys(HEAs) for the first *** *** MgH_(2)-3 wt% TiZrFe_(1.5)MnCrV_(0.5)(labelled as MgH_(2)-3 wt% Fe_(1.5)) composite releases 1526.70 mL/g H_(2) within 5 min at 40℃,and the final hydrolysis conversion rate reaches 95.62% within 10 *** mean hydrogen generation rate of the MgH_(2)-3 wt% Fe_(1.5) composite is 289.16 mL/g/min,which is 2.38 times faster than that of pure MgH_(2).Meanwhile,the activation energy of the MgH_(2)-3 wt% Fe_(1.5) composite is calculated to be 12.53 kJ/mol. The density functional theory(DFT) calculation reveals that the addition of HEAs weakens the Mg-H bonds and accelerates the electron transfer between MgH_(2) and HEAs,Combined with the cocktail effect of HEAs as well as the formation of more interfaces and micro protocells,the hydrolysis performance of MgH_(2) is considerably *** work provides an appealing prospect for real-time hydrogen supply and offers a new effective strategy for improving the hydrolysis performance of MgH_(2).

关键词： Mg-based materials High-entropy alloys Hydrolysis Hydrogen generation Cocktail effect Catalysis

Efficient nanocatalysis of Ni/Sc_(2)O_(3)@FLG for magnesium hydrolysis of hydrogen generation

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Journal of Materials Science & Technology 2024年第8期175卷 235-243页

作者： Haixiang Huang Tingting Xu Jinting Chen Yang Zhao ujie Lv Bogu Liu Bao Zhang Jianguang Yuan Ying Wu School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China institute of Energy power Innovation North China Electric Power UniversityBeijing 102206China

Magnesium is one of the most promising candidates of light metal materials for hydrogen production by hydrolysis due to its efficient and economical *** modification methods have been investigated to improve the hydrolytic properties of ***,the direction of the design of efficient catalysts is unclear and needs to be guided by a richer catalytic mechanism of *** this work,a simple approach was used to synthesize Few Layer Graphene(FLG)-loaded ultra-fine highly dispersed Ni/Sc_(2)O_(3)nanocatalyst,which achieves impressive catalytic hydrolysis ***,the addition of 4 wt%Ni/Sc_(2)O_(3)@FLG catalyst allows Mg to produce 833 mL g^(-1)of H_(2) in 20 s at 30℃.There is an initial hydrogen release rate as high as 5942 mL g^(-1)min^(-1),a final hydrogen yield of 859 mL g^(-1)(99.13%),and almost complete conversion of Mg to Mg(OH)_(2).Furthermore,surprisingly,even with only 0.2 wt%catalysts added,Mg still has an initial hydrogen generation rate of 3627 mL g^(-1)min^(-1),which is over 20 times faster than that of *** also produces 690 mL g^(-1)of H_(2) in 30 s at 30℃.Hydrolysis kinetic curves and microscopic morphology tests show that FLG could shape and hold Mg into thin sheets,giving them an ultra-high hydrolysis rate and conversion *** formation of micro-galvanic cells between Ni and Mg accelerates the electrochemical corrosion of Mg and greatly enhances electron transfer during *** work provides a new strategy for the preparation of efficient nanocatalysts,which is expected to make“Mg-efficient catalyst”the most ideal light metal-based material for hydrogen production by hydrolysis.

关键词： Mg-based materials Hydrolysis Catalyst Hydrogen generation

Audible Noise Performance of High Voltage AC Conductor Bundles at an Altitude of 226lm

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CSEE Journal of power and Energy Systems 2023年第6期9卷 2447-2455页

作者： Wangling He Baoquan Wan Shilong Huang Yunpeng Liu Jiangong Zhang Xiao Han north china electric power university Baoding 071000China china electric power research institute(State Key Laboratory of power Grid Environmental Protection) Wuhan 430074China

Extra or ultra-high voltage transmission lines can exhibit strong corona discharge and generate severe audible noise(AN)at high altitudes,which has become a critical limiting factor for power lines ***,the AN data of bundle conductors at high altitudes are very rare,which cannot adequately support the power utilities to make reasonable conductor *** this paper,a sound pressure level(SPL)of 14 types of bundle conductors is investigated by using an ultra-high-voltage(UHV)corona cage(8 m×8 m×35 m)at an altitude of 2216 m,where the bundle numbers between 4 and 12 and the conductor types are used in 500 kV,750 kV or 1000 kV power transmission *** a large number of valuable AN data are obtained;the influences of bundle numbers and sub-conductor diameters on an acoustic power density level(LPWL)are analyzed;and an A-weighted LPWL calculation method is *** addition,by comparing the AN data obtained from the low-altitude area(altitude:23 m),the AN altitude correction factor is concluded,and the influences of conductor parameters and the surface electric field strength on correction factors are *** results obtained in this paper can provide important data for the construction of high-altitude AC power lines.

关键词： AC power lines audible noise corona discharge high altitude

power-balancing Coordinated Control of Wind power and Demand-side Response Under Post-fault Condition

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Journal of Modern power Systems and Clean Energy 2022年第5期10卷 1207-1215页

作者： Xinshou Tian Yongning Chi Chao Liu Peng Cheng Yan Li china electric power research institute Beijing 100192China north china electric power university Beijing 102206China State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems(china electric power research institute) Beijing 100192China china institute of Energy and Transportation Integrated Development North China Electric Power UniversityBeijing 102206China

As the global energy transforms to renewablebased power system, the wind power generation has experienced a rapid increase. Due to the loss of synchronous machines and its frequency control mechanisms, the gradual evolution leads to critical challenges in maintaining the frequency stability. Under post-fault condition, the wind power generation has a slow recovery due to the fault ride-through(FRT) control strategy and may cause a larger frequency deviation due to the power imbalance between the supply and demand. Then, the impacts of the frequency deviations would further cause inaccuracy and instability in the control system for wind power generation. Considering the long parking time of electric vehicles(EVs), the demand-side response is provided to support the power grid via load-to-grid technology. Thus, a power-balancing coordinated control strategy of the wind power and the demand-side response is developed. It can significantly mitigate the power imbalance, thereby resulting in the enhanced frequency stability. Finally, the simulation results are provided to validate the power-balancing coordinated control strategy.

关键词： power-balancing wind power demand-side response frequency stability post-fault condition

Spatio-temporal Convolutional Network Based power Forecasting of Multiple Wind Farms

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Journal of Modern power Systems and Clean Energy 2022年第2期10卷 388-398页

作者： Xiaochong Dong Yingyun Sun Ye Li Xinying Wang Tianjiao Pu the School of electrical and Electronic Engineering North China Electric Power UniversityBeijing 102206China he china electric power research institute Beijing 100192China

The rapidly increasing wind power penetration presents new challenges to the operation of power *** the accuracy of wind power forecasting is a possible solution under this *** the power forecasting of mul-tiple wind farms,determining the spatio-temporal correlation of multiple wind farms is critical for improving the forecasting *** paper proposes a spatio-temporal convolutional network(STCN)that utilizes a directed graph convolutional structure.A temporal convolutional network is also adopted to characterize the temporal features of wind *** data from 15 wind farms in Australia are used in the case *** forecasting results show that the proposed model has higher accuracy than the existing *** on the structure of the STCN,asymmetric spatial correlation at different temporal scales can be observed,which shows the effectiveness of the proposed model.

关键词： Deep learning spatio-temporal correlation wind power forecasting graph conventional network(GCN).